CN114478037A - Formula for preparing 45 Mullicat from coal gangue and preparation method thereof - Google Patents
Formula for preparing 45 Mullicat from coal gangue and preparation method thereof Download PDFInfo
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- CN114478037A CN114478037A CN202210233653.9A CN202210233653A CN114478037A CN 114478037 A CN114478037 A CN 114478037A CN 202210233653 A CN202210233653 A CN 202210233653A CN 114478037 A CN114478037 A CN 114478037A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
- C04B2235/3472—Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/36—Glass starting materials for making ceramics, e.g. silica glass
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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Abstract
The invention provides a formula for preparing 45 Mullicat by utilizing coal gangue and a preparation method thereof, which can utilize solid waste coal gangue as main raw material to research and develop 45 Mullicat and solve the problem of product defects. The coal gangue is not reversed when the Mullica is prepared, the coal gangue is sedimentary rock and is influenced by geological structure and environment, the structural form of the coal gangue is mainly flaky and stalactite, wherein the volume density of the calcined coal gangue with the flaky structure is better, the structural form of the coal gangue is mainly flaky and stalactite, the volume density of the calcined coal gangue with the flaky structure is better, and particularly the volume density of the calcined coal gangue at 1580-1600 ℃ can reach 2.6g/cm3. The product is yellow in different degrees when used under the working conditions of low and medium temperature (1250 ℃ -1350 ℃), which affects the positive of kiln furnitureIt is often used.
Description
Technical Field
The invention relates to the application field of coal gangue, in particular to a formula for preparing 45 Mullica by utilizing coal gangue and a preparation method thereof.
Background
Morecatt is produced in the United kingdom, and 40% of mullite used in domestic high-grade kiln furniture is imported. The solid waste coal gangue is the best raw material for researching and developing 45 Mullica, the coal resource of China is mainly concentrated in the areas of Jin, Shaan, Mongolia and the like, the electricity consumption demand is continuously increased along with the development of the industry of China, the thermal power generation is taken as the main point, the demand of coal is still large, and in addition, the large development of the coal chemical industry, the amount of the locally converted coal is continuously increased. And (3) solid waste of coal half-life: coal gangue, coal-series kaolin, wood-saving soil and the like are produced in large quantities. These solid wastes pose great difficulties for disposal and landfill in coal manufacturing enterprises. More importantly, the potential huge risk is caused to the environmental pollution. Most mine enterprises are in gully regions, the solid waste is generally disposed and buried in low-lying regions, surface water after rain and snow permeates into buried objects, part of surface water permeates into the underground to pollute underground water sources, and the other part of surface water enters the atmosphere through evaporation, so that the possibility of acid rain is very high.
The coal gangue is waste residue generated in the coal mining process, the discharge amount of the waste residue is always high in all industrial solid fertilizer discharge in China, and the coal gangue stacked in the open air can generate a large amount of dust, so that the coal gangue stacked on the ground can be weathered and crushed after being exposed to the sun and rain for a long time; in addition, the coal gangue can be disintegrated after absorbing water, so that dust is easily generated. The quality of the atmosphere in the mine will be deteriorated by the wind.
The comprehensive utilization project of solid wastes is supported and encouraged by the country and accords with the industrial policy. However, most products in the market are mainly calcined flint clay, cordierite and mullite. The fatal defect of the refractory material is cracking and common industrial diseases. The traditional mullite product has three phases; namely mullite phase, vitreous phase, cristobalite phase. The cristobalite phase is the main cause of cracking of the article. Some manufacturing enterprises increase the mullite phase and reduce the cristobalite phase by increasing the calcination temperature. Thus, although the cracking of the product can be reduced, the product is easy to generate the phenomenon of reverse color when used under the conditions of medium and low working conditions. The general kiln furniture is used at the temperature of 1250-1350 ℃. Under the working condition, the yellow color becomes darker and darker after being repeatedly used.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a formula for preparing 45 Mullica by using coal gangue and a preparation method thereof, wherein the formula can be prepared by using solid waste coal gangue as a main raw materialThe 45 Molecath solves the problem of product defects. The coal gangue is sedimentary rock and is influenced by geological structure and environment, the structural form of the coal gangue mostly takes the shape of sheet and stalactite, wherein, the volume density of the calcined coal gangue with the sheet structure is better, and particularly, the volume density of the calcined coal gangue at 1580 ℃ to 1600 ℃ can reach 2.6g/cm3。
The product is yellow in different degrees when used under the working conditions of low temperature and medium temperature (1250 ℃ -1350 ℃), which affects the normal use of kiln furniture. The volume density of the stalactite coal gangue after high-temperature calcination is 2.4g/cm3The product has good whiteness, and does not reverse color when used under the working conditions of low and medium temperature (1250-1350 ℃).
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the formula for preparing 45 Mullica by utilizing coal gangue is characterized by mainly comprising the following components: 60% of coal gangue A, 33% of coal gangue B and 7% of potassium feldspar.
A preparation method for preparing 45 Mullica from coal gangue comprises the following steps:
(1) firstly, collecting collected materials;
(2) crushing raw ore into fragments smaller than 1.5 cm by a jaw crusher, and then respectively feeding the fragments into three bins;
(3) then, precisely batching the materials in proportion under the control of a plc or dcs system through three electronic metering belt scales under a bin;
(4) the mixed material enters an European plate grinding head bin and is ground into 325 meshes of powder (the content of 45 microns is more than 95 percent) by European plate grinding;
(5) mixing the powder materials by a mixer through an automatic water adding and mixing system;
(6) then the mixture enters an aging tank to be aged for 48 hours;
(7) digging and conveying the mixture to a belt conveyor through a bridge type multi-bucket excavator, conveying the mixture to a stirrer, uniformly stirring the mixture, and extruding the mixture in a vacuum extruder;
(8) then, stacking by a robot, and ventilating and drying;
(9) after the drying is finished, placing the mixture in a kiln for calcining;
(10) after the calcination is finished, the temperature is preserved for 5 hours in a kiln, and then a finished product can be obtained.
As an improvement, the water content of the powder is controlled to be about 15 percent.
As an improvement, the calcination needs high temperature 1540 ℃ in a kiln.
The invention has the beneficial effects that: the formula for preparing 45 Mullica by utilizing the coal gangue and the preparation method thereof have the advantages that no reverse color is used when the Mullica is prepared, the coal gangue is sedimentary rock and is influenced by geological structure and environment, the structural form of the coal gangue is mainly flaky and milky, wherein the volume density of the coal gangue with the flaky structure after calcination is better, and particularly the volume density of the coal gangue after calcination at 1580-1600 ℃ can reach 2.6g/cm3(ii) a The volume density of the stalactite coal gangue after high-temperature calcination is 2.4g/cm3About 50-60% of mullite phase, refractoriness of more than 1710 ℃, and volume density of more than 2.45g/cm3The expansion coefficient curve is similar to the Morekat curve in British, the creep at high temperature is zero, and the product is not discolored when used under the working conditions of low and medium temperature (1250 ℃ -1350 ℃), and is still white after repeated use. The product has no cristobalite phase, and only mullite phase and glass phase.
Compared with the traditional mullite, the service life of the mullite product is prolonged by 50 percent, the turnover frequency of common mullite kiln furniture is generally 40 times, the turnover frequency of the mullite kiln furniture can reach 60 times, the traditional mullite has cristobalite phases in different degrees, and 45 mullite has no cristobalite phases completely, so that the problem that the product is severely shrunk and expanded due to the conversion of four quartz crystal forms along with the rise and fall of the temperature in the use process is solved, and the service life of the product is greatly shortened. The successful emergence of the formula in the formula can completely meet the normal use of products, saves a lot of energy, and is proved through a large number of repeated experiments: the temperature of 1540 ℃ is increased to 1580 ℃, the consumption of natural gas per ton of product is increased by 60 standard cubic meters, and the service life of the kiln and kiln furniture is obviously shortened. Before firing, feldspar can play the role of barren raw materials, reduce drying shrinkage and deformation of the blank, improve drying performance and shorten drying time.
The main functions of the potash feldspar can completely solve the problems of existence of a cristobalite phase, reduction of the calcining temperature and increase of the volume density of the product, and the potash feldspar can be used as a fusing agent to reduce the calcining temperature during calcining, promote the quartz and kaolin to be fused, and mutually diffuse and permeate in a liquid phase to accelerate the formation of mullite. The feldspar glass body generated in the melting process is filled among mullite grains of the blank body, so that the blank body is compact, the gap is reduced, and the mechanical strength and the dielectric property of the blank body are improved. In addition, the generation of the feldspar glass can also improve the light transmittance of the blank. The doping amount of the feldspar in the ceramic blank is different according to different raw materials and different requirements of products.
Detailed Description
The invention is illustrated below by means of specific examples, without being restricted thereto.
Example one
(1) A formula for preparing 45 Mullica by utilizing coal gangue comprises the following components in parts by weight:
60% of coal gangue A, 33% of coal gangue B and 7% of potassium feldspar.
(2) A preparation method for preparing 45 Mullica from coal gangue comprises the following steps:
collecting collected materials, crushing collected raw material ores into fragments smaller than 1.5 cm by a jaw crusher, respectively feeding the fragments into three bins, and accurately batching the materials in proportion under the control of a plc or dcs system by three electronic metering belt scales below the bins; after the mixed material enters an European plate mill head bin, the mixed material is ground into 325-mesh powder (the content of 45 microns is more than 95%) by European plate milling, then the powder is mixed by a mixer through an automatic water adding and mixing system, the water content of the powder is controlled to be about 15%, and the mixed material enters an aging tank for aging for 48 hours; digging and conveying the mixture to a belt conveyor through a bridge type multi-bucket excavator, conveying the mixture to a stirrer, uniformly stirring the mixture, and extruding the mixture in a vacuum extruder; then, stacking by a robot, and ventilating and drying; and after drying, placing the mixture in a kiln for calcination, and during calcination, keeping the temperature in the kiln for 5 hours after calcination and calcination at a high temperature of 1540 ℃ are finished, so as to obtain a finished product.
Example two
(1) A formula for preparing 45 Mullica by utilizing coal gangue comprises the following components in parts by weight:
50% of coal gangue A, 40% of coal gangue B and 10% of potassium feldspar.
(2) A preparation method for preparing 45 Mullica from coal gangue comprises the following steps:
collecting collected materials, crushing collected raw material ores into fragments smaller than 1.5 cm by a jaw crusher, respectively feeding the fragments into three bins, and accurately batching the materials in proportion under the control of a plc or dcs system by three electronic metering belt scales below the bins; after the mixed material enters an European plate mill head bin, the mixed material is ground into 325-mesh powder (the content of 45 microns is more than 95%) by European plate milling, then the powder is mixed by a mixer through an automatic water adding and mixing system, the water content of the powder is controlled to be about 15%, and the mixed material enters an aging tank for aging for 48 hours; digging and conveying the mixture to a belt conveyor through a bridge type multi-bucket excavator, conveying the mixture to a stirrer, uniformly stirring the mixture, and extruding the mixture in a vacuum extruder; then, stacking by a robot, and ventilating and drying; and after drying, placing the mixture in a kiln for calcination, and during calcination, keeping the temperature in the kiln for 5 hours after calcination and calcination at a high temperature of 1540 ℃ are finished, so as to obtain a finished product.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The formula for preparing 45 Mullica by utilizing coal gangue is characterized by mainly comprising the following components: 60% of coal gangue A, 33% of coal gangue B and 7% of potassium feldspar.
2. A preparation method for preparing 45 Mullica from coal gangue comprises the following steps:
(1) firstly, collecting collected materials;
(2) crushing raw ore into fragments smaller than 1.5 cm by a jaw crusher, and then respectively feeding the fragments into three bins;
(3) then, precisely batching the materials in proportion under the control of a plc or dcs system through three electronic metering belt scales under a bin;
(4) the mixed material enters an European plate grinding head bin and is ground into 325 meshes of powder (the content of 45 microns is more than 95 percent) by European plate grinding;
(5) mixing the powder materials by a mixer through an automatic water adding and mixing system;
(6) then the mixture enters an aging tank to be aged for 48 hours;
(7) digging and conveying the mixture to a belt conveyor through a bridge type multi-bucket excavator, conveying the mixture to a stirrer, uniformly stirring the mixture, and extruding the mixture in a vacuum extruder;
(8) then, stacking by a robot, and ventilating and drying;
(9) after the drying is finished, placing the mixture in a kiln for calcining;
(10) after the calcination is finished, the temperature is preserved for 5 hours in a kiln, and then a finished product can be obtained.
3. The method for preparing 45 Mullicat from coal gangue according to claim 2, wherein the moisture content of the powder is controlled to about 15%.
4. The formulation for preparing 45 mollicat from coal gangue as claimed in claim 2, wherein said calcining is carried out at 1540 ℃ in a kiln.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210233653.9A CN114478037A (en) | 2022-03-10 | 2022-03-10 | Formula for preparing 45 Mullicat from coal gangue and preparation method thereof |
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| CN202210233653.9A CN114478037A (en) | 2022-03-10 | 2022-03-10 | Formula for preparing 45 Mullicat from coal gangue and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115231900A (en) * | 2022-06-22 | 2022-10-25 | 萍乡百斯特电瓷有限公司 | Method for producing and manufacturing ultra-high voltage industrial alumina cylinder head porcelain insulator |
-
2022
- 2022-03-10 CN CN202210233653.9A patent/CN114478037A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115231900A (en) * | 2022-06-22 | 2022-10-25 | 萍乡百斯特电瓷有限公司 | Method for producing and manufacturing ultra-high voltage industrial alumina cylinder head porcelain insulator |
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